package com.qs.monitor.interceptor;

import com.alibaba.fastjson.JSON;
import com.qs.monitor.vo.ResultData;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * <pre>
 * @Describe
 * @Version 1.0
 * Modify Information:
 * Author       Date          Description
 * ============ ============= ============================
 * liangpanpan   2021/1/19       create this file
 * </pre>
 */
@Slf4j
public class RedisSessionInterceptor implements HandlerInterceptor {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //无论访问的地址是不是正确的，都进行登录验证，登录成功后的访问再进行分发，404的访问自然会进入到错误控制器中
        HttpSession session = request.getSession();
        if (session.getAttribute("loginUserId") != null) {
            try {
                //验证当前请求的session是否是已登录的session
                String loginSessionId = redisTemplate.opsForValue().get("loginUser:" + session.getAttribute(
                        "loginUserId"));
                if (loginSessionId != null && loginSessionId.equals(session.getId())) {
                    return true;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        response401(response);
        return false;
    }

    private void response401(HttpServletResponse response) {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");

        try {
            response.getWriter().print(JSON.toJSONString(new ResultData(401, "用户未登录！")));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                                Exception ex) throws Exception {

    }

}
